Favorite LittleBee 20A BLHeli_S ESC 2-4S

The LittleBee 20A from Favorite (FVT) is a compact single brushless ESC for 2-4S multirotors, small enough for 250-class and smaller frames. It runs BLHeli_S on a Silabs EFM8BB21 48 MHz MCU with dedicated gate drivers, giving clean freewheeling and strong active braking.

Key features

• 20 A continuous with 25 A peak for up to 10 seconds.
• Damped light (active braking) lets the motors respond faster to throttle cuts for steadier flight.
• OPTO design with no BEC: power the flight controller from a separate 5 V regulator or a PDB with a BEC.
• Supports Oneshot125, Oneshot42 and Multishot from compatible flight controllers.
• Firmware updates through the signal wire via the BLHeli_S bootloader.
• N-channel MOSFETs on a 4-layer PCB with 3 oz copper.

Specifications

• Current: 20 A continuous, 25 A peak (10 s)
• Input voltage: 2-4S LiPo
• MCU: Silabs EFM8BB21 (BusyBee2), 48 MHz
• Firmware: BLHeli_S
• BEC: None (OPTO)
• Dimensions: 24.5 x 12.5 x 3 mm
• Weight: 6 g without wires

Sold as a single ESC, so a quadcopter needs four. Check that your motor's rated maximum current on your chosen cell count stays within 20 A, then set motor direction and timing through a BLHeli_S configurator via flight controller passthrough.